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为进一步研究沉箱-桩复合基础的水平向承载性能,开展粉质黏土中单桩、沉箱-桩复合基础在水平向荷载和竖向及水平向组合荷载作用下的系列试验,对沉箱-桩复合基础的水平荷载与位移关系、桩身弯矩、位移及土抗力分布规律及群桩效应等进行了研究。结果表明,在水平荷载作用下沉箱对桩顶的约束使桩身弯矩分布较桩顶自由情况要更均匀,并能有效地降低桩身弯矩、位移及土抗力,提高了基础水平承载能力;在同时作用有竖向和水平向组合荷载时,沉箱底摩擦力参与抵抗水平力作用、桩顶竖向力也有利于进一步提高基础水平承载力;试验获得了不同桩数、桩顶约束、荷载作用条件下的沉箱-桩复合基础群桩效应系数,对于桩距为6倍桩径的情况,桩与桩之间的相互影响很小。
In order to further study the horizontal bearing capacity of caisson-pile composite foundation, a series of tests of single-pile and caisson-pile composite foundation under silty horizontal load and vertical and horizontal combined load were carried out. The relationship between horizontal load and displacement, the bending moment of pile body, the distribution law of displacement and soil resistance and the effect of pile groups were studied. The results show that under the horizontal load, the constraint of caisson to the pile top makes the distribution of bending moment of pile body more uniform than that of pile top, and can effectively reduce the bending moment, displacement and soil resistance of pile body and improve the basic horizontal bearing capacity ; When both vertical and horizontal combined loads are applied at the same time, the friction force at the bottom of the caisson participates in the resistance to horizontal force and the vertical force at the top of the pile is also conducive to further increase the horizontal bearing capacity of the foundation. The experimental results show that different pile numbers, Under the condition of caisson - pile composite foundation group pile effect coefficient, for pile spacing of 6 times pile diameter, pile and pile mutual influence is small.